Blowing device



Nov. 16 ,1926. 1,606,847

' w. A. SMITH BLOWING DEVICE Filed August 7 1925 Patented Nov. 16 1926.

UNITED STATES PATENT OFFICE.

WILLIAMA. SMITH, or ATHENS, PENNSYLVANIA, ASSIGNQE 'ro INGERSOLL-RANDCOMPANY, or JERSEY CITY, NEW JER EY, A coEPoRA'rIoN or NEW JERSEY.

BLOWING DEVICE.

Application filed August 7, 1925. Serial No. 48,713.

This invention relates to rock drills, but more particularly to ablowing device for fluid actuated rock drills of the hammer type.

The objects of the invention are toselectively admit aiYuninterruptedsupply of pressure fluid under full line pressure to the drill steel forcleansing the drilled hole and to hold the valve and the pistonimmovable while such pressure fluid is passing through the drill steel.7

Other objects will appear hereinafter.

The invention consists of the combinations of elements, features ofconstruction, and arrangement ofparts having the general mode ofoperation, substantially as hereinafter described and more particularlypointed out in the appended claims and illustrated in the accompanyingdrawings, in which- I Figure 1 is alongitudinal diagrammatic view insection of so much of a rock drill as will serve to illustrate theinvention,

Figure 2 is a view similar to Figure 1 showing the reciprocating partsin another position, and

Figure 3 is a view similar to Figures 1 and 2 showing the manner inwhich pressure fluid is admitted to the drill steel.

Referring to the drawings, the invention is shown embodied in a drillhaving a cylinder A provided with a reciprocatory hammer piston B. Afront head C is arranged atthe front end of the cylinder A and iscentralized with respect thereto by a front cylinder washer D.- Thecylinder A and the front head 0 are preferably held in operativeposition by the usual side bolts (not shown).

Disposed within the front head C is a rotatable chuck E having ribs Fwhich cooperate "with flutes G formed on an extension H of the piston Bto prevent relative rotation between said piston and the chuck E. Thefront end of the chuck E is bored as at J to receive a drill steel K andto hold said drill steel against rotation with respect tion and topermit rotation'of the rifle bar with the piston during the oppositestroke of the piston.' The rifle bar L in this in stance 1s adapted toproject through a back cylinder washer O fixed in the rear end of thecylinder A to form a seal for said cylinder, the entire construction notbeing shown. A valve chest P is in this instance arranged longitudinallyof the cylinder A and has a valve chamber Q in which chamber is'arranged a spool type distributing valve R. The ty e of valve hereillustrated is like that covere in the copending application of W. vA.Smith Serial No. 23,181, filed, April 15, 1925, although any suitablevalve in which kicker ports are employed for actuating the valve may beused. The valve shown has a central head S which controls a centralinlet port T and has end heads U and V for controlling the main exhaustports W and X respectively formed on opposite sides of the inlet port T.The ends of the chamber Q, are closed by bushings Y which also serve asstops for limiting the travel of the valve R. Motive fluid for actuatingthe piston is supplied to the rear and front ends of the cylinderthrough supply passages Z and I) respectively communicating with thevalve chamber Q, on opposite sides of the central inlet port T.

Usually in drills employing valves of the type indicated in thedrawings, kicker ports are used for controlling the action of the valve.Such kicker ports may be crossed as in the present instance in which akicker port 0 leading from a'point rearward of the center of thecylinder A communicates with the front end of the valve chamber Q toadmit pressure fluid to said front end for throwing the Valverearwardly. A second kicker port or passage (2 communicating with thecylinder A at a point forwardly of its center extends to a bore 6 formedthrough the valve chest P between the chamber Q, and the cylinder A.Disposed within the bore 6 is a hollow rotatable plug f having an ablongport 9 adapted to constantly register with the passage d. A port k isformed near the rearward end of the hollow plug to register with apassage j leading from the bore e to the rearward end of the valvechamber Q.

Means are also provided for establishing communication between thehollow plug f and the front end of the valve chamber Q.

and to that end a port In" is formed in the front end of the hollow pluf to reglster with a assage in the va ve chest communicatmg at one endwith the front end of the chamber Q. A handle or lever p is securedtoone end of the hollow plug f for rotating said plug and, as in thepresent mstance, may prevent longitudinal movement of the plug in onedirection. A nut q screwed onv the opposite end of thegilug f preventsendwise movement of sea .plug in the other direction.

In the operation of the device with the parts in the positions indicatedin Flgure '1, pressure fluid for reciprocat ng the piston B isdistributed to the opposite ends of the cylinder in the usual manner by.the valve R. During the normal operation of the drill, some leakage maoccur between the piston extension H an the ad acent parts to the drillsteel. Such leakage, however, is insufficient to properly cleanse thedrill hole.- If, after a certain period of drilling, it is desired tomore thoroughly cleanse the drill hole, the plug 7 may be rotated aquarter turn from its normal position as shown in Figures 1 and 2 tothat shown in Figure 3. In this position, the port it is moved out ofregistration with the passage 7' at the rearward end of the valvechamber Q. and at the same time the port is is moved into.

registration with the passage 0 leadilpgto. 1th

the front end of the valve chamber Q.

the plug in this position, a portion of the' pressure fluid admittedthrough the supply passage 6 to the front end of the cglinder A willpass through the passage (1 an g, thence through the hollow plug f andthrough the port is and the pasage 0 into' the front end of the chamberQ and hold the valve against the rearward bushing Y. By thus holdin thevalve rearwardl and immovable the ront supply rt 6 be in constantcommunication wit the inlet port T to admit ressure fluid to the frontend of the cylin er. In this way the piston B is moved to the rearwardlimiting position 1. In a blowing device'for a fluid actuated rockdrill, the combination of a cylinder with a front head, a hammer pistonin the cylinder, a fluted forward extension on said hammer piston, adrill steel supported. in

the port supply of pressure flui from the chamber to one end of thecylinder and along the fluted extension to the drill steel.

2. In a blowing device for a fluid actuated rock drill, the combinationof a cylinder with a front head, a hammer piston in the cylinder, afluted extension on said hammer piston, a drill steel supported in thefront head' to receive the blows of said fluted extension, a valve cheston the cylinder having a chamber, supply passages and kicker portsleading from the chamber to the cylinder, a distributing valve in saidchamber, and manually controlled rotary means in the valve chest formingpart of one kicker port for admitting pressure fluid from the cylinderto the chamber, the pressure fluid thus admitted acting to hold thevalve immovable in one end of the chamber to permit an uninterruptedsupply of ressure .fluid from the chamber to one en of the cylinder andfrom the cylinder along the fluted extension to the drill steel.

3. In a blowing device for a fluid actuated rock drill, the combinationof a cylinder with a front head, a hammer piston in the cylinder, afluted forward extension on said hammer piston and extendinv into thefront head, a drill steel supported in the front head to receive theblows of said fluted extension, a valve chest on the cylinder having achamber, supply passages and kicker orts leading from the chamber to thecylin er, a

distributing valve in said chamber, and a hollow rotatable plug in thevalve chest forming part of one kicker port for admitting pressure fluidfrom the cylinder to one end of the chamber, the pressure fluid thusadmitted acting to hold the valve immovable in the opposite end of thechamber to admit an uninterrupted supply of pressure fluid from thechamber to the cylinder for withdrawing the fluted extension partly fromthe front head and to permit pressure fluid to flow from the cylinder tothe drill steel.

4. In a blowing device for a fluid actuated rock drill, the combinationof a cylinder with a front head, a hammer piston in the cylinder, afluted forward extension on the hammer piston and reciprocable in thefront head, a drill steel supported inthe front head to receive theblows of said fluted extension, a valve chest on the cylinder having achamber, supply passages and the cylinder, a valve in said chamber, and

a hollow plug in the valve chest forming part of on'e'ki'cker port whenin one position and adapted to be rotated-to another position foradmitting pressure fluid from the cylinder to the front end of thechamber to hold the valve immovable in the rearward end of-said chamberin which position of the valve an uninterrupted supply of pressure fluidis admitted from the chamber to the cylinder for withdrawing the flutedextension partly into the cylinder and for permitting an uninterruptedflow of pressure fluid along said fluted extension to the drill steel.

5. In a blowing device for a fluid actuated rock drill, the combinationof a cylinder with a front head, a hammer piston in the cylinder, 21fluted forward extension on the hammer piston and reciprocable in thefront head, a drill steel supported in the fronthead to receive theblows or said, fluted extension, a valve chest on the cylinderhavchamber, and a hollow ing a chamber, supp;

front and rear klC er ports leading from the chamber to the cylinder, adistributing valve in the chamber, a bore between the chamber and thecylinder, a passage leading from the bore to" the front end of the lugin the bore forming part of one kiclEer port when in ODSPOSllIlOIl andadapted to be rotated to another position to register with said passagefor admitting pressure fluid from the l-y passages and crossed cylinderto the front end of the valve to hold said valve immovable in therearward end of the chamber, in which position of the valve pressurefluid may pass from the chamber to the front end of the cylinder forholding the piston in the rearward end of the cylinder to permit thepassage of pressure fluid through the flutes in the extension v WILLIAMA. SMITH.

